Combing experimental methods and molecular simulations to study self-healing behaviors of polyurethane elastomers containing multiple hydrogen bond networks and flexible blocks
Jianlong Wen, Guangwei Xu, Zhaopeng Liang, Sumin Li, Yinmao Wang, Juan Yang, Yijing Nie
Abstract
]-pyrimidinone (UPy) groups that can form reversible quadruple hydrogen bonds. Both of the two PU elastomers have self-healing ability. At low temperatures the PU without UPy groups exhibits stronger self-healing ability, while at high temperatures the PU with UPy groups has better self-healing function. The difference can be attributed to the combined effect of segmental mobility and reversible network strength. Based on molecular simulations, we further observed that the self-healing behaviors are affected by four factors: healing temperature, reversible interaction strength, reversible interaction site density and segment diffusion ability.
Topics & Concepts
Self-healingElastomerMaterials scienceHydrogen bondPolyurethanePolymerPolypropylenePolymer chemistryComposite materialPolypropylene glycolChemical engineeringPolymer scienceChemistryMoleculeOrganic chemistryPathologyPolyethylene glycolEngineeringMedicineAlternative medicinePolymer composites and self-healingPolydiacetylene-based materials and applicationsAntimicrobial agents and applications